package org.apache.lucene.distributed;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Arrays;

import org.apache.lucene.distributed.RMI.ByteArrayWriteable;

/**
 * Implementation of RMISecurity that uses HmacMD5 to sign and verify
 * RMI messages.  
 */
public class HMACRMISecurity implements RMISecurity {
  String key;
  
  /**
   * 
   * @param key Hex encoded HmacMD5 key 
   */
  public HMACRMISecurity(String key) {
    this.key = key;
  }
  
  public void sign(ByteArrayWriteable byteArrayWriteable) throws Exception {
    byteArrayWriteable.signature = Crypto.mac(byteArrayWriteable.bytes, key);
  }
  
  public boolean verify(ByteArrayWriteable byteArrayWriteable) throws Exception {
    byte[] mac = Crypto.mac(byteArrayWriteable.bytes, key);
    return Arrays.equals(mac, byteArrayWriteable.signature);
  }
}
